Minerals ion cartridge brings you clean and clear spa water with reduced reliance on traditional chemicals. The active ingredient is zinc. Inert ingredients include vitamin C, calcium sulfate, zeolite, attapulgite-type clay, zinc oxide, and magnesium oxide. Experience improved water quality that you can see, smell, and feel. Easy to install and low maintenance, this mineral cartridge is compatible with most spa maintenance systems. The mineral filter stick offers a simple solution for maintaining your spa, helping enhance your relaxation experience. Featuring controlled mineral ion release technology, it gradually dissolves trace minerals into the water. Designed to work with existing filtration systems, the mineral stick fits most spa and hot tub filters and functions effectively under continuous 24-hour flow conditions.